FMC Marketing and Merchandising Practice Test

The casket liner is the correct choice because it serves an important role in enhancing the protective qualities of a wooden casket shell. Specifically, the liner is designed to provide a barrier that reduces moisture damage and protects the body inside from potential external elements. It often consists of a soft, cushioned material that adds to the overall aesthetic appeal of the casket, as well as its structural integrity.

In contrast, the other options serve different functions. A combination case is typically used for transporting remains in a casket and may not provide the same protective qualities as a liner. An air tray is primarily designed for shipping purposes and does not enhance the casket's protective features in the same way. Lastly, a metal case is a specific type of casket that offers its own protective advantages but is distinct from the concept of a liner placed within a wooden shell.